LE LEGGI DI OHMMisurare V, i ed R

Esercizi suResistenze in serie e in parallelo

Lezione tratta dal sito http://ocw.mit.edu/Del Massachussets Institute of Tecnology

Dal corso di Fisica 2

Classe 5^ C LSTI.T.T. “Tito Sarrocchi” Siena

a.s. 2011-2012

• Hour 1:• Working with Circuits• Expt. 4. Part I: Measuring V, I, R

• Last Time:• Resistors & Ohm’s Law

Last time

• Measuring Voltage & Current

Measuring Potential Difference

A voltmeter must be hooked in parallel across the element you want to measure the potential difference across

Voltmeters have a very large resistance, so that they don’t affect the circuit too much

Measuring Current

A ammeter must be hooked in series with the element you want to measure the current through

Ammeters have a very low resistance, so that they don’t affect the circuit too much

Measuring Resistance

An Ohmmeter must be hooked in parallel across the element you want to measure the resistance of

Ohmmeters apply a voltage and measure the current that flows. They typically don’t work if the resistor is powered (connected to a battery)

EXERCISES

Exercise 1

Exercise 2

Exercise 3

Exercise 4

Exercise 5